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| author | Jan Beulich | 2006-06-26 13:56:43 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2006-06-26 19:48:15 +0200 |
| commit | 0a1ad60d7a7eb433095bc1b2c8b475f3f278f61d (patch) | |
| tree | b7f0efd5d2afb879b8ff9bfbc44c6ea94b3e7a89 /arch/x86_64/kernel/io_apic.c | |
| parent | [PATCH] x86_64: Clean and enhance up K8 northbridge access code (diff) | |
| download | kernel-qcow2-linux-0a1ad60d7a7eb433095bc1b2c8b475f3f278f61d.tar.gz kernel-qcow2-linux-0a1ad60d7a7eb433095bc1b2c8b475f3f278f61d.tar.xz kernel-qcow2-linux-0a1ad60d7a7eb433095bc1b2c8b475f3f278f61d.zip | |
[PATCH] x86_64: serialize assign_irq_vector() use of static variables
Since assign_irq_vector() can be called at runtime, its access of static
variables should be protected by a lock.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/kernel/io_apic.c')
| -rw-r--r-- | arch/x86_64/kernel/io_apic.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c index 9cc7031b7151..062b10daebac 100644 --- a/arch/x86_64/kernel/io_apic.c +++ b/arch/x86_64/kernel/io_apic.c @@ -56,6 +56,7 @@ int timer_over_8254 __initdata = 0; static struct { int pin, apic; } ioapic_i8259 = { -1, -1 }; static DEFINE_SPINLOCK(ioapic_lock); +static DEFINE_SPINLOCK(vector_lock); /* * # of IRQ routing registers @@ -834,10 +835,16 @@ u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 }; int assign_irq_vector(int irq) { static int current_vector = FIRST_DEVICE_VECTOR, offset = 0; + int vector; BUG_ON(irq != AUTO_ASSIGN && (unsigned)irq >= NR_IRQ_VECTORS); - if (irq != AUTO_ASSIGN && IO_APIC_VECTOR(irq) > 0) + + spin_lock(&vector_lock); + + if (irq != AUTO_ASSIGN && IO_APIC_VECTOR(irq) > 0) { + spin_unlock(&vector_lock); return IO_APIC_VECTOR(irq); + } next: current_vector += 8; if (current_vector == IA32_SYSCALL_VECTOR) @@ -849,11 +856,14 @@ next: current_vector = FIRST_DEVICE_VECTOR + offset; } - vector_irq[current_vector] = irq; + vector = current_vector; + vector_irq[vector] = irq; if (irq != AUTO_ASSIGN) - IO_APIC_VECTOR(irq) = current_vector; + IO_APIC_VECTOR(irq) = vector; + + spin_unlock(&vector_lock); - return current_vector; + return vector; } extern void (*interrupt[NR_IRQS])(void); |